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      <a href="/2018/03/18/vue2-transition-3-javascript-hook/" title="Vue2动画3--Javascript钩子" itemprop="url">Vue2动画3--Javascript钩子</a>
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    <time datetime="2018-03-18T09:05:46.000Z" itemprop="datePublished">2018-03-18</time>
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		<ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#JavaScript-钩子"><span class="toc-number">1.</span> <span class="toc-text">JavaScript 钩子</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#完整的钩子信息"><span class="toc-number">1.1.</span> <span class="toc-text">完整的钩子信息</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#使用-jQuery-的例子"><span class="toc-number">1.1.1.</span> <span class="toc-text">使用 jQuery 的例子</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#初始渲染"><span class="toc-number">1.1.2.</span> <span class="toc-text">初始渲染</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实现逻辑"><span class="toc-number">1.1.3.</span> <span class="toc-text">实现逻辑</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">1.2.</span> <span class="toc-text">结束语</span></a></li></ol></li></ol>
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		<p>最近在捣鼓 Vue 动画的内容，《Vue2 动画》系列用于记录一些使用方法、demo 以及原理分析。本文介绍使用 Javascript 钩子来实现动画效果的过程。</p>
<a id="more"></a>
<h1 id="JavaScript-钩子"><a href="#JavaScript-钩子" class="headerlink" title="JavaScript 钩子"></a>JavaScript 钩子</h1><hr>
<h2 id="完整的钩子信息"><a href="#完整的钩子信息" class="headerlink" title="完整的钩子信息"></a>完整的钩子信息</h2><p>这里我们直接贴出<a href="https://cn.vuejs.org/v2/guide/transitions.html#JavaScript-%E9%92%A9%E5%AD%90" target="_blank" rel="external">官网</a>的展示：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">transition</span></span></div><div class="line">  <span class="attr">v-on:before-enter</span>=<span class="string">"beforeEnter"</span></div><div class="line">  <span class="attr">v-on:enter</span>=<span class="string">"enter"</span></div><div class="line">  <span class="attr">v-on:after-enter</span>=<span class="string">"afterEnter"</span></div><div class="line">  <span class="attr">v-on:enter-cancelled</span>=<span class="string">"enterCancelled"</span></div><div class="line"></div><div class="line">  <span class="attr">v-on:before-leave</span>=<span class="string">"beforeLeave"</span></div><div class="line">  <span class="attr">v-on:leave</span>=<span class="string">"leave"</span></div><div class="line">  <span class="attr">v-on:after-leave</span>=<span class="string">"afterLeave"</span></div><div class="line">  <span class="attr">v-on:leave-cancelled</span>=<span class="string">"leaveCancelled"</span></div><div class="line">&gt;</div><div class="line">  <span class="comment">&lt;!-- ... --&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">transition</span>&gt;</span></div></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// ...</span></div><div class="line">methods: &#123;</div><div class="line">  <span class="comment">// --------</span></div><div class="line">  <span class="comment">// 进入中</span></div><div class="line">  <span class="comment">// --------</span></div><div class="line"></div><div class="line">  beforeEnter: <span class="function"><span class="keyword">function</span> (<span class="params">el</span>) </span>&#123;</div><div class="line">    <span class="comment">// ...</span></div><div class="line">  &#125;,</div><div class="line">  <span class="comment">// 此回调函数是可选项的设置</span></div><div class="line">  <span class="comment">// 与 CSS 结合时使用</span></div><div class="line">  enter: <span class="function"><span class="keyword">function</span> (<span class="params">el, done</span>) </span>&#123;</div><div class="line">    <span class="comment">// ...</span></div><div class="line">    done()</div><div class="line">  &#125;,</div><div class="line">  <span class="attr">afterEnter</span>: <span class="function"><span class="keyword">function</span> (<span class="params">el</span>) </span>&#123;</div><div class="line">    <span class="comment">// ...</span></div><div class="line">  &#125;,</div><div class="line">  <span class="attr">enterCancelled</span>: <span class="function"><span class="keyword">function</span> (<span class="params">el</span>) </span>&#123;</div><div class="line">    <span class="comment">// ...</span></div><div class="line">  &#125;,</div><div class="line"></div><div class="line">  <span class="comment">// --------</span></div><div class="line">  <span class="comment">// 离开时</span></div><div class="line">  <span class="comment">// --------</span></div><div class="line"></div><div class="line">  beforeLeave: <span class="function"><span class="keyword">function</span> (<span class="params">el</span>) </span>&#123;</div><div class="line">    <span class="comment">// ...</span></div><div class="line">  &#125;,</div><div class="line">  <span class="comment">// 此回调函数是可选项的设置</span></div><div class="line">  <span class="comment">// 与 CSS 结合时使用</span></div><div class="line">  leave: <span class="function"><span class="keyword">function</span> (<span class="params">el, done</span>) </span>&#123;</div><div class="line">    <span class="comment">// ...</span></div><div class="line">    done()</div><div class="line">  &#125;,</div><div class="line">  <span class="attr">afterLeave</span>: <span class="function"><span class="keyword">function</span> (<span class="params">el</span>) </span>&#123;</div><div class="line">    <span class="comment">// ...</span></div><div class="line">  &#125;,</div><div class="line">  <span class="comment">// leaveCancelled 只用于 v-show 中</span></div><div class="line">  leaveCancelled: <span class="function"><span class="keyword">function</span> (<span class="params">el</span>) </span>&#123;</div><div class="line">    <span class="comment">// ...</span></div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>这里对进入和离开的动画钩子说明也比较清晰了，我们来看个 demo：</p>
<h3 id="使用-jQuery-的例子"><a href="#使用-jQuery-的例子" class="headerlink" title="使用 jQuery 的例子"></a>使用 jQuery 的例子</h3><p>官方提供一个使用 Velocity.js 的例子，这块本骚年不熟悉，就直接拿个最简单的 jQuery 动画来写把~</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"example-4"</span>&gt;</span></div><div class="line">  <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">"show = !show"</span>&gt;</span></div><div class="line">    Toggle</div><div class="line">  <span class="tag">&lt;/<span class="name">button</span>&gt;</span></div><div class="line">  <span class="tag">&lt;<span class="name">transition</span></span></div><div class="line">    <span class="attr">v-on:enter</span>=<span class="string">"enter"</span></div><div class="line">    <span class="attr">v-on:leave</span>=<span class="string">"leave"</span></div><div class="line">    <span class="attr">v-bind:css</span>=<span class="string">"false"</span></div><div class="line">  &gt;</div><div class="line">    <span class="tag">&lt;<span class="name">p</span> <span class="attr">v-if</span>=<span class="string">"show"</span>&gt;</span></div><div class="line">      Demo</div><div class="line">    <span class="tag">&lt;/<span class="name">p</span>&gt;</span></div><div class="line">  <span class="tag">&lt;/<span class="name">transition</span>&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></div></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">new</span> Vue(&#123;</div><div class="line">  <span class="attr">el</span>: <span class="string">'#example-4'</span>,</div><div class="line">  <span class="attr">data</span>: &#123;</div><div class="line">    <span class="attr">show</span>: <span class="literal">false</span></div><div class="line">  &#125;,</div><div class="line">  <span class="attr">methods</span>: &#123;</div><div class="line">    <span class="attr">enter</span>: <span class="function">(<span class="params">el, done</span>) =&gt;</span> &#123;</div><div class="line">       <span class="comment">// 元素已被插入 DOM</span></div><div class="line">    	<span class="comment">// 在动画结束后调用 done</span></div><div class="line">    	$(el)</div><div class="line">      	.css(<span class="string">'opacity'</span>, <span class="number">0</span>)</div><div class="line">      	.animate(&#123; <span class="attr">opacity</span>: <span class="number">1</span>, <span class="attr">fontSize</span>: <span class="string">'100px'</span> &#125;, <span class="number">1000</span>, done)    </div><div class="line">    &#125;,</div><div class="line">    <span class="attr">leave</span>: <span class="function">(<span class="params">el, done</span>) =&gt;</span> &#123;</div><div class="line">        <span class="comment">// 与 enter 相同</span></div><div class="line">        $(el).animate(&#123; <span class="attr">opacity</span>: <span class="number">0</span>, <span class="attr">fontSize</span>: <span class="string">'0px'</span> &#125;, <span class="number">1000</span>, done)</div><div class="line">    &#125;</div><div class="line">  &#125;</div><div class="line">&#125;)</div></pre></td></tr></table></figure>
<p>可以看看<a href="https://jsfiddle.net/41fuumkz/6/" target="_blank" rel="external">这里的demo</a>。</p>
<p><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/transition2.1.8.png" alt="image"></p>
<h3 id="初始渲染"><a href="#初始渲染" class="headerlink" title="初始渲染"></a>初始渲染</h3><p>Vue 的动画提供了一个初始渲染的开关，指的是第一次展示（而不是第一次切换）的时候是否需要动画效果。</p>
<p>具体可以看看上面的例子，当我们把 show 的默认值设置为 true 的时候，初次展示并不会加载进入动画。</p>
<p>但是当我们在 transition 组件中添加 appear 属性时，则在初次展示时也会加载进入动画：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"example-4"</span>&gt;</span></div><div class="line">  <span class="tag">&lt;<span class="name">button</span> @<span class="attr">click</span>=<span class="string">"show = !show"</span>&gt;</span></div><div class="line">    Toggle</div><div class="line">  <span class="tag">&lt;/<span class="name">button</span>&gt;</span></div><div class="line">  <span class="tag">&lt;<span class="name">transition</span> <span class="attr">appear</span></span></div><div class="line">    <span class="attr">v-on:enter</span>=<span class="string">"enter"</span></div><div class="line">    <span class="attr">v-on:leave</span>=<span class="string">"leave"</span></div><div class="line">    <span class="attr">v-bind:css</span>=<span class="string">"false"</span></div><div class="line">  &gt;</div><div class="line">    <span class="tag">&lt;<span class="name">p</span> <span class="attr">v-if</span>=<span class="string">"show"</span>&gt;</span></div><div class="line">      Demo</div><div class="line">    <span class="tag">&lt;/<span class="name">p</span>&gt;</span></div><div class="line">  <span class="tag">&lt;/<span class="name">transition</span>&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></div></pre></td></tr></table></figure>
<p>可以查看<a href="https://jsfiddle.net/godbasin/41fuumkz/8/" target="_blank" rel="external">demo</a>，尝试将 appear 去掉试试（<a href="https://jsfiddle.net/godbasin/41fuumkz/7/" target="_blank" rel="external">demo</a>），看看区别就能理解了~</p>
<p>当然，你也可以绑定 appear 专属的动画效果：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">transition</span></span></div><div class="line">  <span class="attr">appear</span></div><div class="line">  <span class="attr">v-on:before-appear</span>=<span class="string">"customBeforeAppearHook"</span></div><div class="line">  <span class="attr">v-on:appear</span>=<span class="string">"customAppearHook"</span></div><div class="line">  <span class="attr">v-on:after-appear</span>=<span class="string">"customAfterAppearHook"</span></div><div class="line">  <span class="attr">v-on:appear-cancelled</span>=<span class="string">"customAppearCancelledHook"</span></div><div class="line">&gt;</div><div class="line">  <span class="comment">&lt;!-- ... --&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">transition</span>&gt;</span></div></pre></td></tr></table></figure>
<h3 id="实现逻辑"><a href="#实现逻辑" class="headerlink" title="实现逻辑"></a>实现逻辑</h3><p>上一节<a href="https://godbasin.github.io/2018/03/11/vue2-transition-1-transition-component/">《Vue2动画1–transition组件》</a>中，我们详细描述了在使用 CSS 过渡和动画的时候，具体的实现原理。</p>
<p>而 Javascript 钩子的实现逻辑其实很简单：</p>
<ol>
<li>检测组件是否使用了 Javascript 钩子。</li>
<li>若使用了 Javascript 钩子，则这些钩子函数将在恰当的时机被调用。</li>
</ol>
<p>当然这些钩子分别穿插在各个地方，顺序的话也很明了。这里以离开动画为例子，我们来看看这段被我简化后的代码：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div><div class="line">75</div><div class="line">76</div><div class="line">77</div><div class="line">78</div><div class="line">79</div><div class="line">80</div><div class="line">81</div><div class="line">82</div><div class="line">83</div><div class="line">84</div><div class="line">85</div><div class="line">86</div><div class="line">87</div><div class="line">88</div><div class="line">89</div><div class="line">90</div><div class="line">91</div><div class="line">92</div><div class="line">93</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">leave</span> (<span class="params">vnode: VNodeWithData, rm: Function</span>) </span>&#123;</div><div class="line">  <span class="comment">// el是被动画的元素</span></div><div class="line">  <span class="keyword">const</span> el: any = vnode.elm</div><div class="line"></div><div class="line">  <span class="comment">// 当然如果进入动画还没结束，就取消吧~</span></div><div class="line">  <span class="comment">// call enter callback now</span></div><div class="line">  <span class="keyword">if</span> (isDef(el._enterCb)) &#123;</div><div class="line">    el._enterCb.cancelled = <span class="literal">true</span></div><div class="line">    el._enterCb()</div><div class="line">  &#125;</div><div class="line"></div><div class="line">  <span class="comment">// 嗯，这里获取该获取的东西，包括Javascript钩子和CSS类名</span></div><div class="line">  <span class="keyword">const</span> data = resolveTransition(vnode.data.transition)</div><div class="line">  <span class="keyword">const</span> &#123;</div><div class="line">    css,</div><div class="line">    type,</div><div class="line">    leaveClass,</div><div class="line">    leaveToClass,</div><div class="line">    leaveActiveClass,</div><div class="line">    beforeLeave,</div><div class="line">    leave,</div><div class="line">    afterLeave,</div><div class="line">    leaveCancelled,</div><div class="line">    delayLeave,</div><div class="line">    duration</div><div class="line">  &#125; = data</div><div class="line"></div><div class="line">  <span class="comment">// 这个cb比较重要啦，将</span></div><div class="line">  <span class="keyword">const</span> cb = el._leaveCb = once(<span class="function"><span class="params">()</span> =&gt;</span> &#123;</div><div class="line">    <span class="comment">// 移除v-leave-to和v-leave-active类名</span></div><div class="line">    <span class="keyword">if</span> (expectsCSS) &#123;</div><div class="line">      removeTransitionClass(el, leaveToClass)</div><div class="line">      removeTransitionClass(el, leaveActiveClass)</div><div class="line">    &#125;</div><div class="line">    </div><div class="line">    <span class="keyword">if</span> (cb.cancelled) &#123;</div><div class="line">      <span class="comment">// 如果离开被取消，则移除v-leave类名</span></div><div class="line">      <span class="keyword">if</span> (expectsCSS) &#123;</div><div class="line">        removeTransitionClass(el, leaveClass)</div><div class="line">      &#125;</div><div class="line">      <span class="comment">// 看到了吧，这里埋下了leaveCancelled的Javascript钩子</span></div><div class="line">      leaveCancelled &amp;&amp; leaveCancelled(el)</div><div class="line">    &#125; <span class="keyword">else</span> &#123;</div><div class="line">      rm()</div><div class="line">      <span class="comment">// 这里埋下了afterLeave的Javascript钩子</span></div><div class="line">      afterLeave &amp;&amp; afterLeave(el)</div><div class="line">    &#125;</div><div class="line">    <span class="comment">// 这个离开动画的函数只调用一次啦</span></div><div class="line">    el._leaveCb = <span class="literal">null</span></div><div class="line">  &#125;)</div><div class="line"></div><div class="line">  <span class="comment">// 看看要不要延迟执行啦</span></div><div class="line">  <span class="keyword">if</span> (delayLeave) &#123;</div><div class="line">    delayLeave(performLeave)</div><div class="line">  &#125; <span class="keyword">else</span> &#123;</div><div class="line">    performLeave()</div><div class="line">  &#125;</div><div class="line"></div><div class="line">  <span class="comment">// 嗯，这个才是真正执行的函数</span></div><div class="line">  <span class="function"><span class="keyword">function</span> <span class="title">performLeave</span> (<span class="params"></span>) </span>&#123;</div><div class="line">    <span class="comment">// the delayed leave may have already been cancelled</span></div><div class="line">    <span class="keyword">if</span> (cb.cancelled) &#123;</div><div class="line">      <span class="keyword">return</span></div><div class="line">    &#125;</div><div class="line">    </div><div class="line">    <span class="comment">// 看，这里埋下了beforeLeave的Javascript钩子</span></div><div class="line">    beforeLeave &amp;&amp; beforeLeave(el)</div><div class="line">    <span class="comment">// 下面这是上一节讲到的逻辑，执行CSS过渡动画的</span></div><div class="line">    <span class="comment">// cb是上面定义的回调啦，里面包括afterLeave钩子</span></div><div class="line">    <span class="keyword">if</span> (expectsCSS) &#123;</div><div class="line">      addTransitionClass(el, leaveClass)</div><div class="line">      addTransitionClass(el, leaveActiveClass)</div><div class="line">      nextFrame(<span class="function"><span class="params">()</span> =&gt;</span> &#123;</div><div class="line">        addTransitionClass(el, leaveToClass)</div><div class="line">        removeTransitionClass(el, leaveClass)</div><div class="line">        <span class="keyword">if</span> (!cb.cancelled &amp;&amp; !userWantsControl) &#123;</div><div class="line">          <span class="keyword">if</span> (isValidDuration(explicitLeaveDuration)) &#123;</div><div class="line">            setTimeout(cb, explicitLeaveDuration)</div><div class="line">          &#125; <span class="keyword">else</span> &#123;</div><div class="line">            whenTransitionEnds(el, type, cb)</div><div class="line">          &#125;</div><div class="line">        &#125;</div><div class="line">      &#125;)</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    <span class="comment">// 看，这里还埋下了leave的Javascript钩子</span></div><div class="line">    <span class="comment">// 和其他钩子不同的是，这里传进去cb了</span></div><div class="line">    leave &amp;&amp; leave(el, cb)</div><div class="line">    <span class="keyword">if</span> (!expectsCSS &amp;&amp; !userWantsControl) &#123;</div><div class="line">      cb()</div><div class="line">    &#125;</div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>嗯，大概是这些的逻辑啦，现在大家明白了<code>leave: function (el, done)</code>里的 done 是什么了吧~</p>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>本节我们介绍了 Vue 动画中的 Javascript 钩子，以及相关的一些源码分析。很多时候我们看一个框架内容好多好复杂，其实慢慢理解和思考，一点点拆分下来也不是特别难的啦。</p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
	</div>
	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#JavaScript-钩子"><span class="toc-number">1.</span> <span class="toc-text">JavaScript 钩子</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#完整的钩子信息"><span class="toc-number">1.1.</span> <span class="toc-text">完整的钩子信息</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#使用-jQuery-的例子"><span class="toc-number">1.1.1.</span> <span class="toc-text">使用 jQuery 的例子</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#初始渲染"><span class="toc-number">1.1.2.</span> <span class="toc-text">初始渲染</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实现逻辑"><span class="toc-number">1.1.3.</span> <span class="toc-text">实现逻辑</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">1.2.</span> <span class="toc-text">结束语</span></a></li></ol></li></ol>
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